Méthodes numériques avancées en vibroacoustique basses et moyennes fréquences

Roger Ohayon (1) , Christian Soize (2)

1 LMSSC - Laboratoire de Mécanique des Structures et des Systèmes Couplés
2 ONERA - The French Aerospace Lab [Châtillon]

This paper presents a synthesis of modeling and associated numerical methods for the prediction of linear vibrations of arbitrary structural-acoustic tridimensional systems constituted of a structure containing an internal dissipative acoustic fluid and surrounded by an external inviscid acoustic fluid occupying an unbounded domain. The model includes wall acoustic impedances. For low-frequency vibroacoustic problems, we present reduced matrix models based on Ritz-Galerkin projection of the finite element model using appropriate modal basis. Finally, for medium-frequency vibroacoustic problems, we present the finite element model and solving methods, i.e. a two time scales procedure and a method of construction of appropriate reduced matrix models.

Mots clés: structural acoustics; vibroacoustics; low-frequency vibrations; medium-frequency vibrations; numerical methods; finite element method; boundary element method; reduced matrix models

Domaines: Mécanique [physics.med-ph]; Acoustique [physics.class-ph]

Roger Ohayon, Christian Soize. Méthodes numériques avancées en vibroacoustique basses et moyennes fréquences. Revue Européenne des Éléments Finis, 1999, 8 (5-6), pp.607-637. ⟨10.1080/12506559.1999.10511399⟩. ⟨hal-00765801⟩